EP 0046327 A1 19820224 - Printed matter having elements to indicate counterfeiting, and method for manufacturing such printed matter.
Title (en)
Printed matter having elements to indicate counterfeiting, and method for manufacturing such printed matter.
Title (de)
Mit fälschungssicheren Elementen versehenes bedrucktes Material und Verfahren zur Herstellung eines solchen bedruckten Materials.
Title (fr)
Matière imprimée ayant des éléments pour indiquer la contrefaçon et méthode de fabrication d'une telle matière imprimée.
Publication
Application
Priority
NL 8004703 A 19800820
Abstract (en)
Printed matter comprising a plurality of elements applied in printing and causing in a half tone reproduction a moiré pattern each element being made up of alternatingly print zones and blank zones being delimited by portions of curved lines, said curved lines being comprised in a set of curved lines which set is a topological equivalent of a set of concentric circles (61, 51, 41, 31, 21, 11, 1) wherein the sum of the areas of the print zones equals the sum of the areas of the blank zones. A super element accordingly comprises two or more elements, each element forming a track, the zones in the respective elements or tracks (10, 20, 30, 40, 50, 60, 70) being different as to their width, each element thus representing a different spatial frequency as shown in the figure 2. A method for manufacturing printed matter is characterized in that the print area in an element or super element equals the non-print blank area therein.
IPC 1-7
IPC 8 full level
B41M 3/14 (2006.01); B44F 1/12 (2006.01); G03F 5/22 (2006.01); G07D 7/00 (2006.01)
CPC (source: EP US)
B41M 3/14 (2013.01 - EP); G03F 5/22 (2013.01 - EP); G07D 7/20 (2013.01 - EP US)
Citation (search report)
- FR 1335655 A 19630823 - IMPRIMERIE CHAIX
- GB 1138011 A 19681227 - CANADIAN BANK NOTE CO LTD
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 81200926 A 19810820; NL 8004703 A 19800820